Internal-combustion engine



E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed may 19,

1923 2 Sheets-Shea?. l

HLBQE Juy 15 1 924- y E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed May 19.' 2 Suas-sheet retreated July 15, 1924. 'i

Uniraofsra'ras PATENT' carica.' f

Evnnnrr n; nUn'rNnrr, or Los ANGELES, cALrFonNIA, AssIoNon or ONE-HALF To Y. nomen. A. BBUNELL, or Los ANGELES, CALIFORNIA.

and State of California,

IN'rnnNAL-comnsrron ENGINE To all whom t 'may camera:

Be it known that LEvERn'r'r R. BUR'rNi-rrr, a citizen of the United States, residing at Los Angeles, in the county ofLos Angeles tain new `and useful Improvements in Internal-Combustion Engines, of which the following isa specification'. l

My invention relates to internal combustion engines ofthe two stroke cycle type, and

`has for its principal objects,'to generally im# .prove upon and simplify the constructionof .the existing forms of the two stroke cycle engines and to provide an engine that has a i 16 relatively short ,overalllength and vin which tion engine two power impulses are produced for each complete rotation of the crank shaft. l

VFurther objects of my invention are to provide a two stroke cycle internal combusunit of six cylinders arranged in two series of lthree cylinders cach with the two series co-operating with each other to produce a maximum of engine efficiency', and

to-provide a two stroke cycle engine strucy 25 ture in which the six cylinders thatI compose the engine unit are functioned 1n' power transmission, and gaseous. fuel pumping effect by two crank throws of a'single crank shaft.

- provide an engine of the character referred orseries of three cylinders, are formed at the head end with a clearance common tc both cylinders and the third cylinder of th set ofthree, functioning as a' pumping cylinder and together with the two connecte cylinders, being disposedradially in a plane substantially at right angles to the axis of 'the crankshaft, in line with the center of the throw or crank ofthe l scribedland claimed and illustrated in the accompanying drawings in which:

F 1 is a transverse vertical section taken' 1 l wise through the centers ofa set of cylinders that form one of the units Vimproved engine;

Appiicauoa mea nay 19, 192s.

have invented cerradiating fins 21, crank shaft, tol whichthe pistons of the three cylinders forming a' Serial No. 640,167.

Fig. 2 is a horizontal section taken approximately on the line 2 2 of Fig. 1.

Fig. 3 is a side elevational View of the Acrank shaft.

Referring -by numerals to the accompanying drawings, 10 and 11 designate respec- Atively the upper and lower parts of the crank case, the end walls thereof being provided with suitable bearings for a shaft A12' having two throws or cranks 13 and 14. l

' Secured to the upper portion of the crank case, member 10 and in the same radial plane with the center of crank 13 are two cylinders 15 and 16 that are angularly disposed with respect to each other so that their axes are .radially arranged relative 'to the crank shaft 12.

Cylinder 16, which is the second cylinder in the directionof crank shaft rotation occupies a 'substantially vertical osition directly above the axis of the 'cran shaft and cylinder 15, which is the first cylinder in the direction of crank shaft rotation occupies an angular position immediately to the side 'of said cylinder 16Y lThe upper 16 are connected by a head17, either separately formed or integral, as illustrated and A a chamber 18 in said head connects 'A still further object of my invention is,- to.,

' in 4cylinder 1G. to, wherein two of the cylinders of each setl the clearance -19 in cylinder 15 with the clearance 2O Thus chambers 18, 19 and 20 constitute a common compression, combustion and expansion chamber .inasmuch as. the gaseous fuel inducted into said chamber, is compressed, ignited aud expands therein.

The upper portion of'the walls of the cyl-- inders 15 and 16 and the wall' of head 17 are provided on their external surfacesm'ith heat and seated in head 18 preferably above clearance 20 is a suitable ignition device, preferably a spark plug 22.

Cylinders l5 and 16 are provided respectively, with interiorly arranged open-ended sleeves 23 and' 24 that serve' as liners or pis ton bearings.

Formed through the intermediateporti'on portions ofcylinders 15 and of cylinder l5 and' its lining 23 is'a circumferential 'row 0f exhaust ports 25 and the rtion of.said ports .is such, that they are 1ily uncovered and open, onlyl when'the Eten 26, that reci 'rocates in chamber 19, is

lowerend Aits stroke ortravel. i

i open,

Formed in the intermediate -portion of cyl-v inder 16 and its lining sleeve 24 is a series of gaseous fuel inlet ports 27, that are l0- cated so that they are wholly uncovered and only when the piston 28, that reciprocates in chamber 20, is at the lower end of its stroke or travel.

Piston 28 is connected in the usual manner to crank 13 by a'connecting rod 29 and connecting piston 26 to the lo-wer portion of said rod 29 is a connecting rod 30.

Thus the pistons 26 and 28 that operate in the cylinders 15 and4 16 are practically connected to the same crank of the crank shaft, but owing to the relative angular positions of the cylinders and the slight offset between the axis ofthe pivot between the lower end of rod 30 and rod 29 and the-axis of crank 13, piston^26 travels slightly in advance of piston 28. i

Thus the exhaust ports 25 that are controlled by piston 26, start to open an instant before inlet ports 27 that are controlled by piston 28 start to open and, likewise said exhaust ports are fully closed an instant -prior to the full closing ofsaid inlet ports.

Located directly behind cylinders 15 and 16 and in line longitudinally therewith, are

the cvlinders l5a and 16:l of the second Iset or series of cylinders of the engine, and these last mentioned cylinders are identical in size, form and construction with said cylinders 15 and 16; l The piston (not shown) within cylinder 16a is .connected to crank 14 by a connecting rodr31 and the piston (not shown) within cylinder 15a is connected by a rod 31 to the lower portion of said connecting rod 31.

Arranged in thc4 top of crank case mem ber 10 and to the sido ot' cylinder 16 is a precomprcssion or pumping cylinder 32 that occupies an angular position so that its Aaxis is radial with respect to crank shaft 12.

This cylinder occupies the same radial plane with the cylinders 15 and 16 and a piston 33 .that reciprocatcs within said cylinder iS connected by a rod 34 to the lower portion of connecting rod 29.

Formed through the intermediate portion of the wall of cylinder 32 is a series of gaseous fuel inlet ports 35 and communicating therewith is an annular duct 36 that is connected to a suitable source of gaseous fuel supply, preferably a. Carburetor.

'lhe ports 35are located so that they are wholly uncovered only when piston 33 is at the lower end of its stroke. M

The wall around the upper portionof the cylimler 32 is provided with a'chambcr 36a through which may he circulated the hot gases and products of conil'iustlon that disf-g,

charge from ports 25.

Located in the upper crank case member 1C adjacent to cylinder 32 and in the same radial plane with thc cylinders l5a and 16",

tions to pump compressed is a cylinder 32athat is identical in size,

form and construction with said cylinder 32.

row of cylinders are connected to crank 14..

Leading from the upper portion of precoinpression cylinder 32l to the inlet ports 27 in cylinder 16 is a duct 38, and leading from the upper portion of cylinder 32 to the inlet ports in cylinder 16l is a `similar duct 39.

Thus', pumping cylinder 32 functions for the combustion cylinders 15*l adajacent pumping cylinder 32EL functions for the combustion cylinders .15 and 16.

' The operation of my improved engine is as follows: l

Inasmuch as cranks 13 and 14 are disposed 180 degrees apart, the`pistons 26, 28 and 33 in the -first cylinder unit of the en 'ne will be at the lower ends of their travel w en the pistons in the cylinders 15, 16aL and 32a are at the upper ends of their travel and vice versa. l

When pistons 32 4and 32 are at the lower Iends of their travel, the gaseous fuel ports, such as 35 in the pumping cylinders are wholly opened, thereby admittin gaseous fuel into the piston clearance cham ers with- -in said cylinders. v

As the plstons in the pumping cylinders mofe upwardly therein, the gaseous fuel will be precom ressed in the upper portion of said cyli'n ers and at the same time the gaseous fuel will be. heated by the heated exhaust gases passing through the chamber 36a.

Due to the cross-over arrangement of the ducts 38 and 39,'pumping cylinder 32 funcgaseous fuel into the cylinders 15 and 16a and cylinder 32a functions to pump compressed gaseous fuel into the'cylinders 15 and 16.

llixhaust'ports 25 and inlet ports 27 are openat the, same time, but with said eX- haust ports opening slightly before the opening of said inlet ports andas the latter are o )cned the charge of gaseous fuel from cylin er 32a will pass through duct 38-and inlet ports 27 into chamber 2O and the inrush' of this gaseous fuel will drive -before it practically all the products of combustion from the preceding ignited charge and said products 'of combustion will be forced through chambersy 18 and 19 out through the exhaust ports 25.

As theppistons 26 and 28 move upward in their respective cylinders, the gaseous fuel "charge that practically fills the chambers 18, 1`9`and 20 will be compressed within said chamber 18 and, as the pistons 26 and 28 v and 16a and the 'lll afterthe compressed charge of gaseous fuel second cylinders in each row in the direcwill be ignited by a spark produced by plug tion of crank rotation vbeing joined at their 22 and the expansion following combustion lie-ad ends by a compression clearance cornwill drive said pistons downward on their mon to the chambers in both of said cylinpower stroke. ders, there being ports formed in the walls inasmuch as the pistons in the lwo sets of of all of the cylinders, the ports in the combustion cylinders work, or travel directfirst cylinder in each row in the direction ly opposite to each other, it will be seen that of crank rotation being adapted to func the crank shaft of the engine receives two tion for the exhaust of products of coinpower impulses during each'complete robastion from the first and second cylintation and as a result, a relatively high deders in lthe direction of crank rotation yiii gres of crank shaft power is developed. the respective' rows, the ports inthe second Thus it will be seen that l have produced cylinder of each row functioning for the a two stroke cycle internal combustion en'- admission .of aseoiis fuel to the rst two gine that is of relatively simple structure, cylinders in t e. direction of crank rotavery short in overall length, levoid of all ,f tion in the respective rows, and the third valves and their operating mechanisms, and for last cylinder in each row functioning said engine being composed of relatively few t for the precompression and pumping of parts whichinay be of strong, rugged congaseous fuel for the induction function instruction, therefore making it adaptable for to the second cylinder of the other or opa wide variety of purposes. posite radial rowT of cylinders.

Obviously the size, form and construction An internal combustion engine havof the various parts of my improved may ing six c linders arranged in two radial. be made and substituted for those h'crerows of tiree cylinders each, the first and in described without departing from "the second cylinders'in each row in the direction spirit of the invention, the scope of which of crank rotation being joined at their ends is set forth in the appended claims. by a compression clearance common to the ll claim as my invention: chambers in both of -said cylinders, there l. ,IL two stroke cycle internal combustion being ports formed in the Walls of all of engine having'six cylinders-arranged in`tw0 the cylinders, the ports in the first cylinradial rowswith three cylinders in each row, der in each row in the direction of crank tivo cylinders in each row functioning rotationflseing adapted to function for the combustion cylinders and the third cylinexhaust 'of products of combustion from der in each row functioning as a gaseous the first and second cylinders in the direcfuel precompression and pumping cylintion of crank rotation. in the respective der. rows7 the ports in the second cylinder in A two stroke cycle internal combusthe direction of crank rotation in each row tion engine having six cylinders arrangedl functioning lfor the admission of gaseous in two radial rows with three cylinders in` fuel to thev'rst two cylinders of the reeach row, two cylinders in each row funcspective rows and the third or last lcylinder tioiiiiig as combustion cylinders, the third in each-row functioning for the precocicylinder in each vrow in the direction of pression and pumping of gaseous .fuel for crank rotation functioning as a gaseous the induction function into the second cylfuel precompression and pumping cylininder of the other or opposite radial row der, a crank shaft having two cranks,r pisof` cylinders, pistons arranged for operatons arranged for operation in all of the tion within all of the cylin ers of the two cylinders, the pistons in one row`of` cylinrows, a shaft having' two cranks, each beders being all connected to one crank of ing in line with theaxes of the cylinders the crank shaft and the pistons in the in one radial row and connections between other` rois of cylinders being all connected the pistons in the two rows of cylinders to the other one .of 'the' cranks of the and the respective cranks'.` crank shaft. l In testimony whereof l affix `my signan internal combustion engine havture, ing six cylinders arranged in two radial rows of three 'cylindersl each, the first and EVERETT R. BURTNETT. 

